<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="dialogVisible = true">
            添加角色
          </el-button>
        </el-col>
      </el-row>

      <!-- 角色列表区域 -->
      <el-table :data="roleList" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row :class="['bdbottom', 'vcenter ',i1 === 0 ? 'bdtop' : '']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
              <!-- 渲染一级权限 -->
              <el-col :span='5'>
                <el-tag closable  @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>

              <!-- 渲染二级和三级权限 -->
              <el-col :span='19'>
                <!-- 通过for 循环渲染二级权限 -->
                <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                  <el-col :span='6'>
                    <el-tag closable type='success'  @close="removeRightById(scope.row, item2.id)">
                      {{item2.authName}}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>

                  <el-col :span='18'>
                    <el-tag closable type='warning' 
                            @close="removeRightById(scope.row, item3.id)"
                            v-for="(item3) in item2.children" :key="item3.id">
                      {{item3.authName}}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>

        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button
              type="primary"
              icon="el-icon-edit"
              size="mini"
              @click="showEditDialog(scope.row.id)"
              >编辑</el-button
            >
            <el-button type="danger" icon="el-icon-delete" size="mini"
              @click="removeRoleById(scope.row.id)">删除</el-button
            >
            <el-button type="warning" icon="el-icon-setting" size="mini"
              @click="showSetRightDialog(scope.row)">分配权限</el-button
            >
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 添加角色的对话框 -->
    <el-dialog
      title="添加角色"
      :visible.sync="dialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 内容主体区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="70px"
      >
        <el-form-item label="角色-名称" prop="roleName">
          <el-input v-model="addForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色-描述" prop="roleDesc">
          <el-input v-model="addForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addRole">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改角色的对话框 -->
    <el-dialog
      title="修改角色"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form
        ref="editFormRef"
        :rules="addFormRules"
        :model="editForm"
        label-width="70px"
      >
        <el-form-item label="角色" prop="roleName">
          <el-input v-model="editForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="描述" prop="roleDesc">
          <el-input v-model="editForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editRoleInfo">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed">
      <!-- 树形控件 -->
      <el-tree :data="rightsList" :props="treeProps" 
                show-checkbox node-key="id" 
                ref='treeRef'
                default-expand-all
                :default-checked-keys="defKeys"/>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 所有角色列表数据
      roleList: [],
      // 控制添加角色对话框的显示与隐藏
      dialogVisible: false,
      // 添加角色的表单数据
      addForm: {
        roleName: "",
        roleDesc: "",
      },
      // 添加表单的验证规则对象
      addFormRules: {
        roleName: [
          {
            required: true,
            message: "请输入角名",
            trigger: "blur",
          },
          {
            min: 2,
            max: 10,
            message: "角名的长度在2~10个字符之间",
            trigger: "blur",
          },
        ],
        roleDesc: [
          {
            required: true,
            message: "请对该角色进行描述",
            trigger: "blur",
          },
          {
            min: 5,
            max: 30,
            message: "角色名的长度在5~30个字符之间",
            trigger: "blur",
          },
        ],
      },
      // 控制修改角色对话框的显示与隐藏
      editDialogVisible: false,
      // 查询到的角色信息对象
      editForm: {},
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 所有权限的数据
      rightsList: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点ID值数组
      defKeys: [],
      // 当前即将分配权限的Id
      roleId: ''
    };
  },
  created() {
    this.getRolesList();
  },
  methods: {
    // 获取所有角色的列表
    async getRolesList() {
      const { data: res } = await this.$http.get("roles");
      if (res.meta.status !== 200) {
        return this.$message.error("获取角色列表失败！");
      }

      this.roleList = res.data;
    },
    // 监听添加角色对话框的关闭事件
    addDialogClosed() {
      // 重置对话框
      this.$refs.addFormRef.resetFields();
    },
    // 点击按钮添加新角色
    addRole() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return this.$message.error("请合法输入");
        // 可以发起添加角色的网络请求
        const { data: res } = await this.$http.post("roles", this.addForm);
        if (res.meta.status !== 201) {
          return this.$message.error("添加角色失败！");
        }
        this.$message.success("添加角色成功");
        // 隐藏对话框
        this.dialogVisible = false;
        // 重新获取角色列表数据
        this.getRolesList();
      });
    },
    // 展示编辑角色的对话框
    async showEditDialog(id) {
      this.editDialogVisible = true;
      const { data: res } = await this.$http.get("roles/" + id);
      
      if (res.meta.status !== 200) {
        return this.$message.error("查询角色失败！");
      }
      this.editForm = res.data;
    },
    // 监听修改角色对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    // 点击按钮修改角色信息并提交
    editRoleInfo() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return this.$message.error("请合法输入");
        // 可以发起修改角色信息的网络请求
        const { data: res } = await this.$http.put("roles/" + this.editForm.roleId,
          {
            roleName: this.editForm.roleName,
            roleDesc: this.editForm.roleDesc,
          });
        console.log(res);
        if (res.meta.status !== 200) {
          return this.$message.error("更新角色信息失败！");
        }
        // 关闭对话框
        this.editDialogVisible = false;
        // 重新获取角色列表数据
        this.getRolesList();
        this.$message.success("更新角色信息成功");
      });
    },
    // 根据 ID 删除对应角色信息
    async removeRoleById(id) {
      // 弹框询问角色是否删除数据
      const confirmResult = await this.$confirm('此操作将永久删除角色文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
      }).catch(err => err)

      // 如果角色确认了删除，则返回值为字符串 confirm
      // 如果角色取消了删除，则返回值为字符串 cancel
      if(confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }

      const {data :res} = await this.$http.delete('roles/'+id)
      if (res.meta.status !== 200) {
          return this.$message.error("删除角色失败！");
        }
      // 重新获取角色列表数据
      this.getRolesList();
      this.$message.success("删除角色成功");
    },

    // 根据 ID 删除对应的权限
    async removeRightById(role, rightId) {
      // 弹框询问是否删除权限
      const confirmResult = await this.$confirm('此操作将永久删除角色文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
      }).catch(err => err)

      // 如果权限确认了删除，则返回值为字符串 confirm
      // 如果权限取消了删除，则返回值为字符串 cancel
      if(confirmResult !== 'confirm') {
        return 
      }

      const {data :res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
          return this.$message.error("删除权限失败！");
        }
      // 重新获取权限列表数据
      // this.getRolesList(); 不建议重新渲染，会刷新页面
      role.children = res.data
    },

    // 展示分配权限的对话框
    async showSetRightDialog(role) {

      this.roleId = role.id
      // 获取所有权限的数据
      const {data: res} = await this.$http.get('rights/tree')
      if(res.meta.status !== 200){
        return this.$message.error('获取权限数据失败！')
      }
      // 把获取到的权限数据保存到rightsList中
      this.rightsList = res.data

      // 递归获取三级节点的id
      this.getLeafKeys(role,this.defKeys)

      this.setRightDialogVisible = true
    },

    // 通过递归的形式，获取角色下所有三级权限的id，并保存到defKeys中
    getLeafKeys(node, arr) {
      // 如果当前 node 节点不包含 children 属性，则是三级节点
      if (!node.children){
        return arr.push(node.id)
      }

      node.children.forEach(item => 
        this.getLeafKeys(item,arr)
      )
    },

    // 监听分配权限对话框的关闭事件,清空数组
    setRightDialogClosed() {
      this.defKeys = []
    },

    // 点击为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]

      const idStr = keys.join(',')
      const {data: res} = await this.$http.post(`roles/${this.roleId}/rights`, {rids: idStr})
      if(res.meta.status !== 200) {
        return this.$message.error('分配权限失败！')
      }

      this.$message.success('分配权限成功')
      this.getRolesList() 
      this.setRightDialogVisible = false
    }
    
  },
};
</script>

<style scoped>
.el-tag {
  margin: 8px;
  margin-left: 50px;
}

.bdtop{
  border-top: 1px solid #eee;
}

.bdbottom {
  border-bottom: 1px solid #eee;
}

.vcenter {
  display: flex;
  align-items: center;
}
</style>